Date registered: Feb 2012
Vehicle: S550 4-Matic
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I had to do this (Originally a W211 E Class without Sirius had a MOST RING with a connected yellow wire connection and unconnected orange wires in the car. If you wanted to install sirius......you just unplug the yellow connection and jump in between it with the orange connection.
So to remove the unit just disconnect the yellow fiber from the orange connector and reconnect it back to the yellow fiber. Leave the orange disconnected. This is the signal that is sent by the sirius unit to the command.) I found this post
thank you very much eric thanks for your time I really appreciate this